linux-kernel - [PATCH v2 8/8] ARM: dts: ux500: Add eSRAM nodes

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Message-Id: <20230417-ux500-dma40-cleanup-v2-8-cdaa68a4b863@linaro.org>
Date:   Thu, 27 Apr 2023 14:10:03 +0200
From:   Linus Walleij <linus.walleij@...aro.org>
To:     Vinod Koul <vkoul@...nel.org>, Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>
Cc:     dmaengine@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        Linus Walleij <linus.walleij@...aro.org>
Subject: [PATCH v2 8/8] ARM: dts: ux500: Add eSRAM nodes

The U8500 has 640 KB of eSRAM, split into 5 banks of 128 KB
each. Add this to the device tree, with ESRAM 0, 1+2 and 3+4
as separate devices, since these have different power domains.

Signed-off-by: Linus Walleij <linus.walleij@...aro.org>
---
 arch/arm/boot/dts/ste-dbx5x0.dtsi | 73 +++++++++++++++++++++++++++++++++++++--
 1 file changed, 71 insertions(+), 2 deletions(-)

diff --git a/arch/arm/boot/dts/ste-dbx5x0.dtsi b/arch/arm/boot/dts/ste-dbx5x0.dtsi
index fead7afd5517..c34ccde04600 100644
--- a/arch/arm/boot/dts/ste-dbx5x0.dtsi
+++ b/arch/arm/boot/dts/ste-dbx5x0.dtsi
@@ -110,6 +110,74 @@ soc {
 		interrupt-parent = <&intc>;
 		ranges;
 
+		/*
+		 * 640KB ESRAM (embedded static random access memory), divided
+		 * into 5 banks of 128 KB each. This is a fast memory usually
+		 * used by different accelerators. We group these according to
+		 * their power domains: ESRAM0 (always on) ESRAM 1+2 and
+		 * ESRAM 3+4.
+		 */
+		sram@...00000 {
+			/* The first (always on) ESRAM 0, 128 KB */
+			compatible = "mmio-sram";
+			reg = <0x40000000 0x20000>;
+			#address-cells = <1>;
+			#size-cells = <1>;
+			ranges = <0 0x40000000 0x20000>;
+
+			sram@0 {
+				compatible = "stericsson,u8500-esram";
+				reg = <0x0 0x10000>;
+				pool;
+			};
+			lcpa: sram@...00 {
+				/*
+				 * This eSRAM is used by the DMA40 DMA controller
+				 * for Logical Channel Paramers (LCP), the address
+				 * where these parameters are stored is called "LCPA".
+				 * This is addressed directly by the driver so no
+				 * pool is used.
+				 */
+				compatible = "stericsson,u8500-esram";
+				label = "DMA40-LCPA";
+				reg = <0x10000 0x800>;
+			};
+			sram@...00 {
+				compatible = "stericsson,u8500-esram";
+				reg = <0x10800 0xf800>;
+				pool;
+			};
+		};
+		sram@...20000 {
+			/* ESRAM 1+2, 256 KB */
+			compatible = "mmio-sram";
+			reg = <0x40020000 0x40000>;
+			#address-cells = <1>;
+			#size-cells = <1>;
+			ranges = <0 0x40020000 0x40000>;
+		};
+		sram@...60000 {
+			/* ESRAM 3+4, 256 KB */
+			compatible = "mmio-sram";
+			reg = <0x40060000 0x40000>;
+			#address-cells = <1>;
+			#size-cells = <1>;
+			ranges = <0 0x40060000 0x40000>;
+
+			lcla: sram@...00 {
+				/*
+				 * This eSRAM is used by the DMA40 DMA controller
+				 * for Logical Channel Logical Addresses (LCLA), the address
+				 * where these parameters are stored is called "LCLA".
+				 * This is addressed directly by the driver so no
+				 * pool is used.
+				 */
+				compatible = "stericsson,u8500-esram";
+				label = "DMA40-LCLA";
+				reg = <0x20000 0x2000>;
+			};
+		};
+
 		ptm@...ae000 {
 			compatible = "arm,coresight-etm3x", "arm,primecell";
 			reg = <0x801ae000 0x1000>;
@@ -536,9 +604,10 @@ usb_per5@...e0000 {
 
 		dma: dma-controller@...C0000 {
 			compatible = "stericsson,db8500-dma40", "stericsson,dma40";
-			reg = <0x801C0000 0x1000 0x40010000 0x800>;
-			reg-names = "base", "lcpa";
+			reg = <0x801C0000 0x1000>;
+			reg-names = "base";
 			interrupts = <GIC_SPI 25 IRQ_TYPE_LEVEL_HIGH>;
+			sram = <&lcpa>, <&lcla>;
 
 			#dma-cells = <3>;
 			memcpy-channels = <56 57 58 59 60>;

-- 
2.40.0